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Grass Valley Guide

  • Walking tours (1)
  • Before You Go
Hardrock Trail and Osborn Hill Loop
Hardrock Trail and Osborn Hill Loop

Welcome to Empire Mine State Historic Park, home to Empire Mine, which was once the most profitable gold mine in California during the gold rush. This hike will take you around the Empire Mine site...

Rated 5 out of 5 by EveryTrail members